初始温度及碳源对碳纳米管气相爆轰法合成的影响

改变初始温度以及分别使用甲烷和乙炔气体作碳源时气相爆轰合成碳纳米管,研究了初始温度与不同碳源对碳纳米管的影响。利用X射线衍射(XRD)、透射电镜(TEM)、拉曼(Raman)光谱等对碳纳米管进行表征。结果表明,随着初始温度的升高,所合成的碳纳米管的产量减少且石墨化程度降低,但管壁会变得光滑且管径有所增加。当使用乙炔时,所合成的产物中没有碳纳米管,而是合成了石墨化程度较高的无定形碳,随着催化剂量的增加,产物中碳包覆颗粒增多且包覆层清晰可见,但存在结构缺陷。当初始温度在110~130 ℃时,使用甲烷气体运用气相爆轰的手段是合成碳纳米管的较佳方案。

Influence of initial temperature and carbon source on carbon nanotubes prepared by gaseous detonation

In the paper, the effects of two factors changing initial temperature and using methane and acetylene as different carbon source on synthesis of carbon nanotubes(CNTs) by gaseous detonation were studied. The CNTs were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM) and Raman spectroscopy. The results show that with the increase of the initial temperature, the yield of the synthesized carbon nanotubes is reduced and the degree of graphite is reduced, but the wall of the tube will be smooth and the diameter of the pipe will be increased. When using the acetylene, there are no carbon nanotubes in the synthesized products but synthesized amorphous carbon with higher graphitization degree. With increase of the amount of catalyst, product carbon coated particles increase and coating layer is clearly visible, but there are some structural defects. When the initial temperature ranges from 110 ℃ to 130 ℃, the use of methane gas is a better solution for the synthesis of CNTs with the gaseous detonation method.